Toronto and the GTA are both set to get new telephone area codes next month.

Toronto phone numbers will soon start with 437, alongside 416 and 647. In the areas currently served by 905 and 289, residents will be assigned numbers starting with 365.

The new area codes will be active as of March 25, but the existing ones will continue to be assigned until none are left.

“Increasing demand for telephone numbers, particularly for wireless devices, has created the need for additional numbers to serve customers in these regions,” the Telecommunications Alliance, a coalition of phone service providers, said in a news release Wednesday.

New area codes are also being introduced this year in BC, the Prairies and the Maritimes.